6
7.4.1 BAUD RATE SELECT
SW1 and SW2 select one out of four available baud rates.
300 BPS
4800 BPS
9600 BPS
19200 BPS
OFF
SW1
SW2
OFF
ON
OFF
OFF
ON
ON
ON
7.4.2 ID CODE
Up to eight DRA-DCC-8s can be connected in a multidrop configuration. Switches
SW3, SW4, and SW5 (MSB) set the ID code.
7.4.3 COMMAND FORMATS
Without echo back
The host computer sends a massage and does not receives an
acknowledgment.
With echo back
The host computer sends a message and receives an acknowledgment stating
the DRA-DCC-8 ID number and the addressed channel number.
Status report
Three types of command formats are available:
7.4.3.1. WITHOUT ECHO BACK FORMAT
[A] [ID CODE] [CHANNEL VALUE] [CR]
The character A begins the command block.
The second byte is the ID code (07). The third byte is the addressable channel
number (07). Up to four bytes of a channel's value can be in BCD mode (0-4095).
Leading zeroes can be omitted. The last byte is [CR] which must terminate the
command block.
7.4.3.2. WITH ECHO BACK FORMATS
[C] [ID CODE] [CHANNEL VALUE] [CR]
This format differs only in the opening character. After every command block
transfer, the DRA-DCC-8 echoes back the following:
